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Tractor Talk Discussion Forum

pin shearing

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benny sepulvado

02-18-2006 21:19:17




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can someone tell me why my overrun coupler pin
shears when i use my implements mostly when i
use tiller

thank you




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Tom in TN

02-19-2006 07:39:14




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 Re: pin shearing in reply to benny sepulvado, 02-18-2006 21:19:17  
Hey Benny,

In addition to what the other guys said, I might ask whether or not the pins that you are using are tight, rolled-pins that need to be driven into the PTO shaft. I had a couple of solid pins that were small enough to slip into the hole without having to be driven in. They would break because they'd slip into the outer portion of the overrunning clutch while the PTO was in use, and then they'd snap when the outer portion overran the inner portion.

I got some properly sized rolled-pins and haven't had any problems since.

Good luck,

Tom in TN

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Errin OH

02-19-2006 05:24:04




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 Re: pin shearing in reply to benny sepulvado, 02-18-2006 21:19:17  
Like Rick said; trying to carry the load due to a warn shaft. But it could also be carry a load if there is much play in the implement pto drive line. A change in load will cause the drive line to creat a certain amount of push pull shock. A baler with a three piece pto shaft will take one out fairly quick. Quicker if you picking up and baling on turns. DBDT



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RickB

02-19-2006 03:50:33




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 Re: pin shearing in reply to benny sepulvado, 02-18-2006 21:19:17  
The tractor"s output shaft is worn enough so instead of the splines holding the coupler in alignment, the roll pin is trying to do that job as well as keeping the coupler from sliding off the shaft. Or as suggested, the PTO shaft is bottoming out or binding.



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Bob

02-18-2006 21:32:23




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 Re: pin shearing in reply to benny sepulvado, 02-18-2006 21:19:17  
If the PTO shaft is too long, or binds, so it doesn't telescope freely as the tiller moves, following the contour of the ground, it will push or pull on the ORC, and break the pin.

You do have the correct coupler for the size of the tractor's PTO shaft, so it is tight on the splines, right?



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